Cisco Systems 6000 manual Routing to VIP Addresses Without RHI, Routing to VIP Addresses With RHI

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Configuring Route Health Injection

Note On power-up with RHI enabled, the CSM sends a message to the MSFC as each VIP address becomes available.

The MSFC periodically propagates the VIP address availability information that RHI provides.

Note RHI is normally restricted to intranets because, for security reasons, most routers do not propagate host-route information to the Internet.

Routing to VIP Addresses Without RHI

Without RHI, traffic reaches the VIP address by following a route to the client VLAN to which the VIP address belongs. When the CSM powers on, the MSFC creates routes to client VLANs in its routing table and shares this route information with other routers. To reach the VIP, the client systems rely on the router to send the requests to the network subnet address where the individual VIP address lives.

If the subnet or segment is reachable but the virtual servers on the CSM at this location are not operating, the requests fail. Other CSM devices can be at different locations. However, the routers only send the requests based on the logical distance to the subnet.

Without RHI, traffic is sent to the VIP address without any verification that the VIP address is available. The real servers attached to the VIP might not be active.

Note By default, the CSM will not advertise the configured VIP addresses.

Routing to VIP Addresses With RHI

With RHI, the CSM sends advertisements to the MSFC when VIP addresses become available and withdraws advertisements for VIP addresses that are no longer available. The router looks in the routing table to find the path information it needs to send the request from the client to the VIP address. When the RHI feature is turned on, the advertised VIP address information is the most specific match. The request for the client is sent through the path where it reaches the CSM with active VIP services.

When multiple instances of a VIP address exist, a client router receives the information it needs (availability and hop count) for each instance of a VIP address, allowing it to determine the best available route to that VIP address. The router picks the path where the CSM is logically closer to the client system.

Note With RHI, you must also configure probes because the CSM determines if it can reach a given VIP address by probing all the real servers that serve its content. After determining if it can reach a VIP address, the CSM shares this availability information with the MSFC. The MSFC, in turn, propagates this VIP availability information to the rest of the intranet.

 

Catalyst 6000 Family Content Switching Module Installation and Configuration Note

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78-11631-02 Rev. A0

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Contents Contents Overview Describes the features of the CSM FeaturesThese sections describe the CSM Front Panel Description CSM front panel features are shown in FigureStatus LED RJ-45 Connector Operation ModeOff Red Orange Green Green to Orange Content Switching Module and Servers Client-to-Content Switching Module-to-Server Traffic Flow Client-to-CSM-to-Server Traffic FlowSafety Overview System Requirements CSM memory is not configurableMemory Requirements Power Requirements Hardware SupportedEnvironmental Requirements 72-876-01 Console Cable Not applicableInstalling the Content Switching Module Preparing to Install the CSMRequired Tools Software RequirementsInstalling the CSM Power supply Installing Modules in the Catalyst 6000 Family Switch Verifying the Installation Verifying the InstallationAccessing Online Help Using the Command-Line InterfaceUpgrading to a New Software Release Upgrading from the Supervisor Engine Bootflash Set up a session between the supervisor engine and the CSMCSM upgrade 127.0.0.zz c6slb-apc.revision-num.bin Routerconfig# power cycle module slot-numberRouterconfig# tftp-server slotxc6slb-apc.revision-num.bin CSM upgrade slot0 c6slb-apc.revision-num.binRouter config# power cycle module slot-number Upgrading from a Pcmcia CardConfiguring the Content Switching Module SwitchportSwitchport access vlan Router# vlan databaseConfiguration Overview Configuring VLANs Configure the required parameters in the following sectionsConfiguring VLANs See for the following notesConfiguring Client-Side VLANs Configuring Server-Side VLANsConfiguring Server Farms Configuring Real Servers Configuring Policies Configuring Maps Configure multiple cookies into a cookie map Configure multiple cookiesConfiguring Sticky Groups Configuring Virtual Servers Configuring TCP Parameters Configuring Dynamic Feedback ProtocolConfiguring Redirect Virtual Servers Configuring Client NAT Pools Writing and Restoring Configurations Configuring Server NATConfiguration Examples Single Subnet Bridge Mode ConfigurationEnter the Vlan mode Configure a client-side VlanConfigure a server-side Vlan Exit to have the configuration take effectVlan mode Secure Router Mode ConfigurationCreate the client-side Vlan 2 and enter the SLB Fault-Tolerant Configuration Routerconfig# ip slb vlan 3 serverCreate the server-side Vlan 3 and enter the SLB Exit the submodeRouter# configure terminal Routerconfig# mac access-list extended VenusRouterconfig# int GigabitEthernet 2/1 Routerconfig-if#service-policy input VenusFault-tolerant configuration, the following rules apply Configuration Parameter On Both Content Switching ModulesCreate the client-side Vlan 2 and enter the SLB Vlan mode Assign the Content Switching IP address onRouter B Hsrp address 192.158.38.10Assign the default route for Vlan Define Vlan 9 as a fault-tolerant VlanCreate the Content Switching primary Configure a client-side VLAN2Configuring Hsrp Hsrp Configuration OverviewConfigure Switch 2-FT2 Hsrp secondary as follows CSG VlanConfiguring CSM VLANs Configure VLANs on Hsrp FT2 as followsConfigure EtherChannel on both switches as follows Configuring Probes for Health MonitoringAdd ports to the EtherChannel as follows Probe-name is the name of the probe being configured it has Http creates an Http probe with a default configurationIcmp creates an Icmp probe with a default configuration Telnet creates a Telnet probe with a default configurationCommands Available to all Probe Configurations Http ProbeIcmp Probe FTP, SMTP, and Telnet Probe TCP ProbeDNS Probe Submode Understanding RHI Configuring Route Health InjectionRHI Overview Routing to VIP Addresses Without RHI Routing to VIP Addresses With RHIConfiguring RHI for Virtual Servers Routerconfig# ip slb vserver vserver1Understanding How the CSM Determines VIP Availability Understanding Propagation of VIP Availability InformationSafety Information Referral Warning Translated Safety WarningsRegulatory Standards Compliance Wrist Strap Warning Blank Faceplate Installation Requirement Warning Translated Safety Warnings Qualified Personnel Warning Related DocumentationRelease Notes for Catalyst 6000 Family IOS Software Obtaining Documentation World Wide WebDocumentation CD-ROM Ordering DocumentationContacting TAC by Using the Cisco TAC Website To access Cisco.com, go to the following websiteObtaining Technical Assistance Cisco.comContacting TAC by Telephone Obtaining Technical Assistance
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